Best 4TB NAS hard drives
Drive Capacity Tech Class Interface AFR £/TB Price
1 WD40EFPX
WD Red Plus
4 TB CMR NAS SATA - £51.71 £207
2 WD4005FFBX
WD Red Pro
4 TB CMR NAS-Pro SATA - £44.99 £180
3 WD4004FRYZ
WD Gold
4 TB CMR Enterprise SATA - £68.12 £272
4 ST4000VN006
Seagate IronWolf
4 TB CMR NAS SATA - £40.00 £160
5 ST4000NT001
Seagate IronWolf Pro
4 TB CMR NAS-Pro SATA - £46.25 £185
6 ST4000VX016
Seagate SkyHawk
4 TB CMR Surveillance SATA - £39.00 £156
7 HDWG440
Toshiba N300
4 TB CMR NAS SATA - - -
8 HDWR440
Toshiba X300
4 TB CMR Desktop SATA - £89.79 £359
9 WD40EZAX
WD Blue
4 TB CMR Desktop SATA - £102.81 £411

Ranked by measured failure rate (Backblaze AFR). $/TB uses the cheapest live price where available.

Every drive here is a CMR (RAID-safe) 4TB model in current production. For a NAS or RAID array, pick the lowest failure rate you can afford; enterprise drives (Exos, Ultrastar, MG) trade some noise and power draw for the longest workload ratings. See how to choose a NAS drive for the full rundown.

Frequently asked questions

What is the most reliable 4TB NAS drive?
None of the 4TB drives have large-scale Backblaze failure data yet; choose by manufacturer class and warranty.
Are 4TB NAS drives CMR or SMR?
Every 4TB drive we recommend for NAS use is CMR (conventional recording), the RAID-safe choice. We exclude SMR drives from NAS picks.